

Chris Hendon and Robin Bumbaugh Give a Lesson on Grinding and Electrochemistry
6 snips Oct 31, 2023
In this engaging discussion, Chris Hendon, a computational materials chemistry expert and author, and Robin Bumbaugh, a PhD candidate and researcher, dive into the thrilling science behind coffee. They explore experimental findings on the effects of grind particle size and moisture on electrochemistry during coffee grinding. Topics include tribo-electrification, the role of salt concentrations, and innovative techniques for improving coffee quality. Listeners will learn how chemistry enhances our daily brew while enjoying anecdotes about favorite drinks and the joys of coffee culture.
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Static and Moisture
- Static buildup during coffee grinding is primarily determined by bean moisture content.
- Beans with over 2% water charge positively, while those below 2% charge negatively, impacting extraction and shot times.
The Spritzing Technique
- Spritzing coffee beans with a small amount of water before grinding can improve extraction and reduce static.
- This technique helps distribute fines evenly, leading to slower but more even extractions.
A Volcanologist's Insight
- The study's origin stemmed from a collaboration between coffee scientists and a volcanologist observing rock fracturing.
- Experiments with saltwater spritzing revealed that electrostatic charging, not ionic charging, is the primary mechanism during grinding.